Question: How to solve this question 4. (5pt) Let Sn = So + Et-1 Xn be a simple symmetric random walk, ie. So = 0, and

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4. (5pt) Let Sn = So + Et-1 Xn be a simple symmetric random walk, ie. So = 0, and Xi, i = 1, ..., are i.i.d. such that P(Xi = 1) = P(Xi = -1) = 1/2. Compute Po( V2

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